OLED Pixel Stack With Control Electrode for Brightness and Resolution
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Solution Overview
Problem
OLED display panels often fail to meet user requirements in terms of display brightness and resolution, limiting their promotion and adoption.
Innovation Solution
A display panel design featuring a base substrate with a driving layer and light-emitting units that include a first and second circuit, a light-emitting layer with a specific structure of electrode and insulating layers, and an active layer with adjustable electronic injection capacity, where the control electrode layer is positioned between the first electrode and active layers to simplify manufacturing and enhance electronic injection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control electrode layer is positioned between the first electrode layer and the active layer, then the electronic injection capacity of the active layer is enhanced and manufacturing is simplified, but the structural complexity of the light-emitting unit increases
Solution Approach 1:
The control electrode layer is positioned in the thickness direction between the first electrode layer and the active layer, utilizing the vertical dimension to achieve electronic injection enhancement without expanding the planar footprint. This dimensional arrangement allows the control electrode to modulate electron injection into the active layer while maintaining a compact pixel structure that can be densely packed.
Solution Approach 2:
The control electrode layer is nested within the vertical stack of the light-emitting unit, positioned between the first electrode layer and the active layer. This nesting approach integrates the control function within the existing structural hierarchy, allowing multiple functional layers to occupy the same planar space at different vertical levels, thereby enhancing functionality without proportionally increasing device area.
2Manufacturing precision
If the first insulating layer is defined with a notch to expose the first electrode layer, then the organic light-emitting layer can be precisely positioned, but the manufacturing precision requirements increase
Solution Approach 1:
The notch is pre-formed in the first insulating layer before depositing the organic light-emitting layer. This preliminary structuring creates a built-in alignment feature that guides the subsequent deposition process, ensuring the organic light-emitting layer is automatically positioned over the exposed first electrode layer region without requiring additional alignment steps or complex positioning mechanisms.
Solution Approach 2:
The notch in the first insulating layer serves as an intermediary structural feature that mediates between the first electrode layer and the organic light-emitting layer. It provides a physical template that defines the registration area, allowing the organic light-emitting layer to be deposited with precise positioning relative to the underlying electrode structure through a simplified process.
3Reliability
If the second insulating layer separates the control electrode layer from the organic light-emitting layer and active layer, then electrical isolation is achieved, but the number of layers and device complexity increase
Solution Approach 1:
The second insulating layer is introduced to extract and isolate the control electrode layer electrically from the organic light-emitting layer and active layer. This separation allows the control electrode to function independently without electrical interference from the light-emitting components, enabling precise control of electron injection while maintaining clear functional boundaries between different layers of the device.
Solution Approach 2:
The second insulating layer provides localized electrical isolation specifically where the control electrode layer interfaces with the organic light-emitting layer and active layer. Rather than insulating the entire device, the insulating layer is strategically positioned to provide electrical separation only in the critical region where control electrode functionality must be independent from the light-emitting elements.
Data Source
AI summary
The disclosure provides a display panel, a manufacturing method thereof and a display device, relating to a field of display technology. The display panel includes a base substrate, a driving layer and a light-emitting layer. The light-emitting units formed by the light-emitting layer includes a first electrode layer, a first insulating layer, a control electrode layer, a second insulating layer, an active layer, a second electrode layer, and an organic light-emitting layer sequentially distributed. In the embodiments of the present disclosure, the second insulating layer is configured to separate the control electrode layer from the organic light-emitting layer and the active layer.